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The distance vector algorithm (sometimes referred to as the Bellman-Ford algorithm for the people who invented it), requires each machine involved in the routing process to keep track of its "distance" from all other possible destinations What happens is that a router is programmed to construct a table of all possible destinations (in terms of network numbers) and measure the distance to each location The only information a router has at boot time is what networks are directly attached to it So how can it find out about all other possible destinations Each router is programmed so that it announces all the destinations it knows about, along with the distance to each Once a router starts hearing all the advertisements from other routers, it can start to list all the possible destinations and calculate the shortest path to these destinations the one kept in the routing table So a distance vector protocol will, on a regular basis, send out an update that contains all the information contained in the machine's routing table These updates are sent only to neighboring routers on directly connected segments One of the key differences between distance vector and link state routing is that link state protocols send information to routers on remote segments Once these updates get to a router, the router will then use a collection of algorithms and timers to decide what entries should be put into the routing table of the machine that is receiving the updates Another key aspect of distance vector protocols is that any given machine knows only the next hop in the sequence to deliver the packet to its ultimate destination In link state protocols, each machine has a complete map of the network it is in (or, more accurately, the routing area it is in but we will come to that later) To finish this introduction, let's take a high-level overview of the code behind the distance vector algorithm: 1Each router has a unique identification on the internetwork 2Every router will identify a metric to be associated with each link directly connected to itself 3All routers will start advertising directly connected links with a metric of zero 4Every router transmits to neighbors the complete information regarding all destinations and their metric when the router first boots, then periodically, and whenever a router becomes aware of a change 5Each router determines which directly connected neighbor offers the lowest metric to each l i.

This chapter wouldn t be complete without a discussion of how the cabling for the network is configured In 1 you learned about the different types of cables, and this section will identify related terms you need to know for the exam that surround cabling as a topic

Enter enable password [abadabado]: Enter virtual terminal password [gobirds]: Configure SNMP Network Management [yes]: Community string [public]: Configure IPX [yes]: Configure bridging [no]: Configure IP [yes]: Configure IGRP routing [no]: Configure RIP routing [yes]: Configuring interface parameters: Configuring interface Ethernet0: Is this interface in use [yes]: Configure IP on this interface [yes]: IP address for this interface [19272463]: Number of bits in subnet field [0]: Class C network is 19272460, 0 subnet bits; mask is 2552552550 Configure IPX on this interface [yes]: IPX network number [110]: Configuring interface Serial0: Is this interface in use [yes]: Configure IP on this interface [yes]: Configure IP unnumbered on this interface [no]: IP address for this interface [4013674]: Number of bits in subnet field [22]: Class A network is 4000, 22 subnet bits; mask is 255255255252 Configure IPX on this interface [no]: The following configuration command script was created: hostname CISCO4000 enable secret 5 $1$soiv$pyh65GwUNxX9LK90w7yc enable password abadabado line vty 0 4 password gobirds snmp-server community public ipx routing no bridge 1 ip routing

For the Network+ exam you need to be familiar with the term plenum Plenum refers to the space between the ceiling tiles and the floor located above them This space is typically used to route power and network cables It is important to use plenumgrade cables in this space because if there is a fire and you are not using plenumgrade cables, a toxin is given off that could be carried throughout the building, causing harm to individuals Plenum-grade cabling uses a low-toxicity material for the jacket of the cable in case of fire

3:

Most companies have network jacks located in the walls that allow systems to connect to the network These jacks have cables connected to them that are then routed a long distance to a patch panel in a server room The patch panel then has a patch cable that connects to the front of the patch panel and a Cables are typically port on a switch When a computer connects connected from the wall jack to the patch to the network jack in the wall, the patch cable panel by a punch-down toolThere are is used to map that system to the port on the a few standards for wiring patch panels; switch The concept of the patch panel allows 66 block is used for wiring the telephone ease of administration and flexibility in moving system, while 110 block is used to wire the systems from one switch to another without patch panel for CAT 5 UTP cable visiting the workstation Figure 3-28 displays a patch panel

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